.5 million people need humanitarian assistance. the international medical humanitarian organization, doctors without borders, says in one city alone there are tens of thousands of people, many of them wounded, trapped by the intense fighting in deir ezzor. a coordinate we are doctors without borders joins me from luzon, switzerland. i know you weren't able to get into the city during your trip. but how close did you get and what did you see? >> well, we have been able to get to the outskirts of the city and discuss with different medical associations and medical personnel to get an idea of the situation within the city. >> what do they need? i know you guys are in every tough place in the world, you are there with the sold yes, with the fighters, with the reporters. what do they need in this particular city, deir azzour? >> inside deir azzour, they are in great need of replacing the doctor there for months now, working around the clock. and four doctors in a field hospital inside the city where they have to serve a population of between 10 and 30,000 people. and they need, of course, supply.